Re: [Feature request] Map hostnames to IP addresses

Betty <[email protected]> wrote:

> Some domains (for example, many Google services) are blocked in China and
> they won't resolve to the correct IP addresses. If we specify the correct
> IPs to those domains in the "hosts" file
> (C:\Windows\System32\drivers\etc\hosts), we can visit those sites.
> The problem with the hosts file is that it does not support wildcards. We
> have to write many lines in the hosts file like this:
> 203.208.46.200 0.docs.google.com
> 203.208.46.200 1.docs.google.com
> 203.208.46.200 2.docs.google.com
> 203.208.46.200 3.docs.google.com
> 203.208.46.200 4.docs.google.com
> 203.208.46.200 5.docs.google.com
> 203.208.46.200 6.docs.google.com
> 203.208.46.200 7.docs.google.com
> 203.208.46.200 8.docs.google.com
> 203.208.46.200 9.docs.google.com
> This is only a small fraction. The actual file has hundreds of lines.
> Google uses a lot of domains!
> 
> My feature request is to let Privoxy have the ability to map certain
> hostnames to certain IP addresses, while supporting wildcards. Hopefully we
> won't need the hosts file and we can write in Privoxy's action file
> something like:
> 
> 203.208.46.200 *.docs.google.com
> 
> (Please note that 203.208.46.200 is not a proxy. It is an IP used by
> Google. Using "forward" in Privoxy does not work.)
> 
> Is that possible? Thank you.

Yes that's already possible using the client-header-filter directive:
http://config.privoxy.org/user-manual/actions-file.html#CLIENT-HEADER-FILTER

If you add a filter like the following to one of your filter files:

CLIENT-HEADER-FILTER: rewrite-to-203.208.46.200 Rewrite the request destination to 203.208.46.200 and keep the Host header unmodified. May or may not fool the GFW of China.
s@^(\w+) (http://)?([^/ ]+?)([/ ])@$1 $2\203.208.46.200$4@

You can enable it in one of your action files with something like:

{+client-header-filter{rewrite-to-203.208.46.200}}
.docs.google.com/

Note that Privoxy can also be used with Tor, though:
http://www.privoxy.org/faq/misc.html#TOR

Tor provides censorship resistance out of the box:
https://www.torproject.org/

Fabian

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